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Altera_Forum's avatar
Altera_Forum
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10 years ago

Cyclone IV: Different Voltage Levels on different IO Banks

Quick question regarding a design for a Cyclone IV.

I want to run IO Banks at different voltages specifically a few at 3.3V and a few at 1.8V. Reading through the documentation this seems to be allowed and part of the MultiVolt IO system.

But then I read the top line on page 11-3 of this Altera document: https://www.altera.com/en_us/pdfs/literature/hb/cyc/cyc_c51011.pdf which confused me a bit. It states "Supply all device VCCIO pins that have MultiVolt I/O capabilityat the same voltage level (e.g., 3.3-V, 2.5-V, 1.8-V, or 1.5-V). SeeFigure 11–2."

Can anyone confirm for me that I can run seperate IO banks(seperate VCCIO pins) at different voltages?

Thanks!

3 Replies

  • Altera_Forum's avatar
    Altera_Forum
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    10 years ago

    The document you're looking at is from 2008 appears to be for the original Cyclone family, not Cyclone IV. So you can safely disregard that requirement.

  • Altera_Forum's avatar
    Altera_Forum
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    10 years ago

    It is possible to run different banks with different voltages, but NOT with different voltages at one Bank.